FreeSWITCH can play back stereo files it'll just mux them down to mono before playing... can you elaborate on the error you're getting?

/b

On Oct 10, 2009, at 12:40 AM, Seven Du wrote:

Yes, it's discussed before.

http://wiki.freeswitch.org/wiki/Channel_Variables#RECORD_STEREO

set that var to false before you record.